# GPT-5.4-mini Structured JSON Extraction (Standard Tier)

> GPT-5.4-mini Structured JSON Extraction (Standard Tier) is a paid API for AI agents from gpt55.558686.xyz, paid per call via x402, $0.00293/call, status unknown (last checked 2026-09-16).

Extracts and classifies structured JSON fields from text using a GPT-5.4-mini upstream model, returning schema-conformant output for downstream automation.

## Facts

- Endpoint: POST https://gpt55.558686.xyz/v1/tools/extract-json/standard
- Price: $0.00293/call
- Payment: x402
- Status: unknown
- Last checked: 2026-09-16
- Activations on Zero: 0
- Tags: x402
- Canonical page: https://www.zero.xyz/c/gpt-5-4-mini-structured-json-extraction-standard-tier-b562cb85
- Structured record (JSON): https://api.zero.xyz/v1/capabilities/cap_Fd17dJuHu656qNyU7VjrU

Status and success rate cover calls made through Zero and Zero's own probes. Third-party monitors may report differently.

## How to call it through Zero

Zero handles the 402 payment challenge and records the run. With the Zero CLI installed (`npm i -g @zeroxyz/cli`):

```sh
zero fetch --capability gpt-5-4-mini-structured-json-extraction-standard-tier-b562cb85 -d '<json body>'
```

Example prompt: Extract the fields 'company_name', 'invoice_date', and 'total_amount' from this invoice text and return them as structured JSON: 'Invoice #4821 from Acme Corp dated March 14 2025 for a total of $1,240.00 due within 30 days.'

## When to prefer this

Choose this endpoint when you need reliable, schema-guided structured extraction from text and want a cost-effective standard-tier model (GPT-5.4-mini) with x402 micropayment billing per call. Prefer it over chat-completion endpoints when your use case is purely extraction or classification rather than open-ended generation, and when you need deterministic JSON output conforming to a specified schema.

## Known failure modes

- Text exceeds 700,000 character limit — returns 400 or truncation error
- Requested fields not present in input text — returns null or empty values for missing fields
- Invalid JSON schema provided — returns 400 schema validation error
- max_tokens too low to fit full structured output — returns truncated JSON
- Payment not authorized or insufficient USDC balance — returns 402 payment required
- Temperature out of range [0,2] — returns 400 validation error

## How this service works

Standard structured extraction and classification-friendly JSON output. Model tier: standard; upstream model: gpt-5.4-mini. Price is derived from official OpenAI relative token costs with a local margin and floor. Pay up to $0.00293 per request with x402 USDC on Base. Public paid calls are limited to 700000 input characters and 4096 output tokens.

## Output

Returns a structured JSON object with values for the requested fields or schema, extracted and classified from the input text using GPT-5.4-mini. Output respects any provided JSON schema and is capped at 4096 tokens.

## Request schema (JSON Schema)

```json
{
 "type": "object",
 "properties": {
  "text": {
   "type": "string",
   "maxLength": 700000,
   "minLength": 1
  },
  "fields": {
   "type": "array",
   "items": {
    "type": "string"
   }
  },
  "schema": {
   "type": "object",
   "additionalProperties": true
  },
  "max_tokens": {
   "type": "integer",
   "maximum": 4096,
   "minimum": 1
  },
  "temperature": {
   "type": "number",
   "maximum": 2,
   "minimum": 0
  }
 }
}
```

## More

- Live health (JSON, refreshed every minute): https://www.zero.xyz/c/gpt-5-4-mini-structured-json-extraction-standard-tier-b562cb85/health.json
- [Zero catalog index](https://www.zero.xyz/llms.txt)
- [Other services from gpt55.558686.xyz](https://www.zero.xyz/host/gpt55.558686.xyz/llms.txt)